Method of making mortar bandages



June 17, 1941. ,M,QADESTY 2,245,666

METHOD OF MAKING MORTAR BANDAGES Filed Nov. 30, 1937 2 Sheets-Sheet l usmmxm'vg lNl/EN TOR J. M. HA RDESTV 1 [3b ATTORNEY U %c%ndd June 1941- J. M. HARDESTY METHD OF MAKING MORTAR BANDAGES 2 Sheets-Sheet 2 Filed Nov. 30, 1937 FIG. 9

FIG. 8

INVENTOR By J. M. HARDES 7')" c %mdd ATTORNEY Patented June 17, 1941 UNITED STATES PATENT OFFICE METHOD OF MAKING MORTAR BANDAGES James M.'Hardesty, Morristown, N. J., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application November 30, 1937, Serial No. 177,194

3 Claims.

This invention relates to the making of joints in underground conduits and more particularly to a method and means for making mortar bandages used in making such joints.

An object of the present invention is the provision of a mortar bandage or wrapper which comprises a single piece'of fabric so folded that it will confine and reinforce the cementitious material which forms the bandage.

Another object of the invention-is the provision of a mortar bandage which can be made with a minimum amount of skill and labor.

A further object of the invention is the provision of a mold or form for making mortar bandages which will expedite the work and assure a uniform finished product.

A still further object of the invention is to pro- Vide a method of making a mortar bandage, for joining conduits and the like, which utilizes a single piece of fabric for the envelope and for the reinforcing means on the interior thereof.

In accordance with the present invention, my improved mortar bandage comprises a single sheet of cheesecloth, or some similar fabric, the length of which is sufficient to surround the conduits to be joined and allow for a slight overlap. The bandage is formed by placing a sheet of fabric in a suitable tray or mold which may comprise two longitudinal sections hinged together at their meeting edges'and spaced a slight distance apart. Each section or tray is of a lengthsufficient to accommodate the sheet of fabric and of a width suificient to overlap the abutting ends of the conduits to be joined. After the. fabric has been placed in the mold or form with sufficient material overhanging each edge thereof, a strip of water-proof paper, or some similar material, is positioned over the fabric in one of the hinged sections. Mortar or some other cementitious material is then introduced into the mold on top of the fabric and paper strip until the mold is completely filled. After the cementitious material is troweled evenly the overhanging edges of the fabric are folded over onto the cementitious material and the sections of the mold are folded over in proper sequence to provide a mortar bandage which is a complete envelope having a strip of water-proof material adjacent one side thereof and a central reinforcing strip of fabric and a double layer of fabric adjacent the water-proof paper strip.

The mortar bandage or wrapper of this invention is applied to the conduits to be joined, in the manner disclosed in my previous Patent 1,959,421, dated May 22, 1934, and the bandage and method of making the same is an improvement over the bandage and method of making such bandage as described therein.

The invention will be clearly understood from the following description when read in connectious material in the left-hand section of the mold;

Fig. 4 is a view similar to Fig. 2 with the mold sections in their original position but with the bandage now in the left-hand section and the remaining piece of fabric folded thereon, and tying tapes in position'in the right-hand mold section;

Fig. 5 shows the bandage now in position in the right-hand section of the mold with the tying tapes underneath;

Fig. 6 is a view similar to Fig. '5 but with the left-hand section of the mold'back in its original position and the completed bandage now in position in the right-hand sectionof the mold, ready for removal;

Fig. 7 is a fragmentary cross-section of View of the completed bandage, taken of line 'l--'! of Fig. 8;

Fig. 8 illustrates the completed bandage being rolled in order that it may be conveniently handled;

Fig. 9 is a view of the completely rolled band- Fig. 10 illustrates the bandage in position beneath the end of a conduit;

Fig. 11' illustrates the method in which the bandage is applied to the abutting ends of the conduit; and

Fig. 12 illustrates the completed joint with the mortar bandage of this invention in place and held thereby means of tapes. 7

As shown in Figs. 1 to 6, inclusive, there is provided a mold or form which comprises two tray sections Ill and H hinged together and spaced apart at their meeting edges. These tray members are mounted on a suitable support which comprises the cross-members l2 and the supporting legs l3. The tray sections l and II are positioned on the cross-members I2 so that their outer edges overhang and each section may be folded one over the other.

In Fig. 1 I have shown the tray members It: and H in their open or normal position with a sheet. of fabric M, which may be cheesecloth, positioned in the trays and overhanging the edges thereof. The fabric I4 is of sufficient length to completely surround the conduits to be joined and allow for a slight overlap, and the width is approximately four times that of each of the sec-- tions 10 or H of the mold. After the fabric l4 has been positioned in the mold, as shown in Fig. 1, as heretofore described, a strip of water-proof material l5, such as paper, is placed over the fabric and in the tray section II. A quantity of cementitious material l6 sufficient to fill the trays l0 and i I is then introduced over the paper strip I and the fabric M, which is then troweled off smoothly, as shown in Fig. 1. The next step, as shown in Fig. 2, is to fold the right-hand overhanging portion of the fabric 14 over onto the cementitious material [5 in the tray H and pat it down into contact therewith. The tray I I with the cementitious material l5 therein, and the fabric 14 in contact therewith, is then folded over onto the tray section H], as shown in Fig. 3.

This operation places the right-hand overhang ing strip of fabric in the center of the mold with the cementitious material 16 on each side thereof. After the tray section II has been firmly pressed into engagement, it is folded back into its normal position and the left-hand overhanging portion of the fabric I4 is laid over the top of the bandage, as shown in Fig. 4; As shown in this figure, tapes I! and 18 are positioned in the tray l I preparatory to the next operation, which 3 is the folding over of the tray section IS] onto the tapes I! and I 8 in the tray section II, as shown in Fig. 5. The tray section it! is then folded back into its normal position, as shown in Fig. 6, and the bandage I9 is now ready to be rolled up with the tapes I! and. i8 inside thereof as shownin Figs. 8 and 9.

After the bandage l9 has been rolled up as shown in Fig. 9, it is then ready to be applied to the conduit end and as shown in Fig. 10, it is unrolled a sufficient amount to allow the conduit 20 to be placed thereon. It will be noted that the end of the conduit 2i) is placed On the bandage in such a manner that it overlaps the bandage approximately one-half its width. As shown in Fig. 11, the conduit 20 is in place with another section of conduit 2| abutting, and the mortar bandage i9 is being applied around the ends thereof so as to completely cover the joint therebetween. After the bandage I9 is smoothed out and placed around the ends of the conduits 20 and 2|, it is secured in place by means of the tapes I1 and I8. (See Fig. 12.)

The method of making the mortar' bandages as herein described and which forms the subject-matter of this invention results in a uniform product and one which is not difficult to handle and which requires little skill on the part of the installer.

While there is shown and described herein the preferred embodiment of my invention, it is understood that it is not limited or confined to the precise method herein disclosed, as modifications and variations may be made therein without departing from the spirit of the invention and that I am only limited by the scope of the appended claims.

What is claimed is:

1. A method of making a bandage or wrapper for joining conduits and the like which comprises placing a piece of fabric in a hinged traylike mold, comprising front and rear sections, with the front and rear portions of said fabric overhanging the edges of said sections, placing a layer of cementitious material over said fabric to fill up both sections of said mold, folding the rear overhanging portion of the fabric over into contact with the cementitious material located in the rear tray section to form an envelope for said material, folding over said rear tray section so that the envelope contained therein contacts the remaining layer of cementitious material located in the front tray section, restoring the rear tray section to its normal position and then folding the remaining front overhanging portion of the fabric over into intimate contact with said. envelope located in the front tray section.

2. A method of making a bandage or wrapper for joining conduits and the like which comprises placing a piece of fabric in a hinged traylike mold, comprising front and rear sections, with the front and rear portions of said fabric overhanging the edges of said sections, placing a layer of cementitious material over said fabric to fill up both sections of said mold, folding the rear overhanging portion of the fabric over into contact with the cementitious material located in the rear tray section to form an envelope for said material, folding over said rear tray section so that the envelope contained therein contacts the remaining layer of cementitious material located in the front tray section, restoring the rear tray section to its normalposition, folding the remaining front overhanging portion of the fabric over into intimate contact with said envelope located in the front tray section, placing a pair of tapes in said'rear tray section" and then folding said front tray section, with the envelope contained therein, over the rear tray section'so that the tapes in the'rear'tray section are positioned on the bottom of said envelope.

3. A method of making a bandage or wrapper for joining conduits and the like which comprises placing a piece of fabric in a hinged traylikemold, comprising front and rear'sections, with the front and rear portions of said fabric overhanging the edges of said sections, positioning a strip of waterproof material over a portion of said fabric, placing a layer of cementitious material over said fabric and said waterproof material to fill up both sections of said mold, folding the rear overhanging portion of the fabric over into contact with the cementitious material located in the rear tray section to form an envelope for said material, folding over said rear tray section so that the envelope contained therein contacts the remaining layer of cementitious material located in the front tray' section, restoring the rear tray'section to its normal position and then folding the remaining front overhanging portion of the fabric over into intimate contact "with said envelope located in the front tray section.

JAMESM. HARDESTY. 

